Drink can go cold when served up (6)

I believe the answer is:

cognac

I'm a little stuck... Click here to teach me more about this clue!

'drink' is the definition.
(I know that Cognac is a Alcoholic beverage)

'can go cold when served up' is the wordplay.
'COGNAC' is hidden back-to-front in amongst the letters.
But, I'm uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for cognac that I've seen before include "strong drink" , "High-quality brandy" , "Good brandy" , "Brandy as for Napoleon (6)." , "High quality brandy" .)

I've seen this clue in The Sun.

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